Question for anybody

Without taking a pregnancy test, how can you know if you pregnant? I have a lot of symptoms, like nausea, heart burn, mood swings, tiredness, smell adverse effects, food cravings, and some that arent always listed like red blotches on my palms of my hands, itchy skin, cramping, back aches. How can I know with all of these without taking test? (My period hasn't come along yet, but I have never been regular.) I just need some answers on what someone else thinks before I go buy a test.